Cleaning heads and vacuum cleaners comprising same

ABSTRACT

A cleaning head ( 100, 200 ) comprising: a suction interface; a suction network connected to the suction interface, the suction network comprising a waste collection port and a waste container ( 150, 250 ) interconnecting the suction interface and the waste collection port; a suction compartment in fluid communication with the waste collection port, the suction compartment comprising an elongate entry aperture; a roller cleaner ( 120, 220 ) mounted inside the suction compartment, the roller cleaner ( 120, 220 ) having an elongate outer surface portion protruding through the elongate entry aperture; a machine compartment ( 260 ) inside which a drive mechanism ( 266 ) and electronic circuitry ( 262 ) are mounted; a storage portion comprising a cleaning liquid container ( 140, 240 ) and the waste container ( 150, 250 ) mounted on a storage receptacle ( 118 ); a cleaning liquid applicator configured to draw cleaning liquid from the cleaning liquid container ( 140, 240 ) and to apply the cleaning liquid to the roller cleaner ( 120, 220 ), and a waste remover configured to physically interact with the roller cleaner ( 120, 220 ) to remove waste therefrom.

FIELD

The present disclosure relates to cleaning heads, and more particularly to vacuum cleaning heads having a roller cleaner, and vacuum cleaners comprising same.

DISCLOSURE

A cleaning head of or for use with a vacuum cleaner is disclosed. The cleaning head is a brush head comprising a roller brush, a motor for driving the roller brush, a washer liquid tank, a washer liquid applicator, a waste liquid collection arrangement, a waste liquid tank, control circuitry, a rigid housing and a suction inlet; wherein the control circuitry is to operate the motor to drive the roller brush into brushing rotation and to operate the washer liquid applicator to apply washer liquid to the roller brush and the waste liquid collection arrangement is to collect waste washer liquid from the roller brush and to deliver collected waste washer liquid to the waste liquid collector for storage therein during operations when the suction inlet is connected to a suction power source.

The brush head may be part of a vacuum cleaner, for example, a detachable vacuuming head of a vacuum cleaner such as a stick-type or tower-type vacuum cleaner.

FIGURES

The present disclosure will be described and/or illustrated with reference to the accompanying Figures in which:

FIG. 1 is a perspective view of an example brush head according to the present disclosure,

FIGS. 1A and 1B are top perspective views of the example brush head of FIG. 1 with the tank cover and the tank assembly removed respectively,

FIG. 1B1 is a bottom perspective view of the tank assembly of the example brush head of Figure

FIG. 1C is an exploded view of the example brush head of FIG. 1,

FIG. 2 is a top plan view of the example brush head of FIG. 1,

FIGS. 3A and 3B are, respectively, a first, left, side view and a second, right, side view of the example brush head of FIG. 1,

FIGS. 3C and 3D are, respectively, front view and rear view of the example brush head of FIG. 1,

FIG. 3A1 is a longitudinal cross-sectional view of the example brush head of FIG. 2 taken along a longitudinal axis X-X′,

FIG. 4 is a bottom perspective view of the example brush head of FIG. 1 taken from underneath the bottom surface of the brush housing,

FIGS. 4A and 4B are bottom plan views, in line drawing and photographic representation respectively, of the example brush head of FIG. 1,

FIG. 4C is a bottom plan view of the example brush head of FIG. 1 with the roller brush and bottom cover plate removed,

FIGS. 5A to 5F are various views showing use and operation of the example brush head of FIG. 1,

FIGS. 6A to 6C are various views of a stick-type vacuum cleaner comprising a brush head of the present disclosure,

FIG. 6D shows the stick-type vacuum cleaner of FIG. 6A in an alternate configuration,

FIG. 7 is a perspective view of another example brush head according to the present disclosure,

FIGS. 7A and 7B are, respectively, top and bottom views of the example brush head of FIG. 7,

FIG. 8A is a perspective view of the example brush head of FIG. 7 with the bottom cover plate removed,

FIG. 8B is a perspective view of the bottom cover plate of the example brush head of FIG. 7,

FIG. 8C is a perspective view of the example brush head of FIG. 7 with the movable portion partly removed,

FIG. 8D is a perspective view of the example brush head of FIG. 7 with the movable portion and roller brush removed,

FIG. 9A and FIG. 10A perspective views of the rigid housing of the example brush head of FIG. 7,

FIG. 9B and FIG. 10B are, respectively, enlarged views of portion A in FIG. 9A and portion B in FIG. 10A,

FIGS. 11A and 11B are perspective views of the tank assembly of the example brush head of FIG. 7,

FIG. 12 is a longitudinal cross-sectional view of the example brush head of FIG. 7A taken along a longitudinal axis Y-Y′,

FIG. 13 is a perspective view of the example brush head of FIG. 7 with upper housing portions and tank covers removed,

FIG. 14 is a perspective view of the example brush head of FIG. 13 with a liquid distribution plate removed,

FIG. 15 is a perspective view of the example brush head of FIG. 14 with a control board further removed, and

FIG. 16 is an exemplary system block diagram of the brush head of FIG. 7.

DESCRIPTION

An example brushing apparatus is a brush head 100 comprising a rigid housing 110 on which a roller brush 120, a tank assembly 130 comprising a first tank 140 defining a first reservoir and a second tank 150 defining a second reservoir, a first liquid delivery path to deliver washer liquid from the first reservoir to the roller brush, a second liquid delivery path for transporting used liquid from the roller brush to the second tank, and a suction connector 190 having a suction inlet are mounted depicted in FIGS. 1, 1A, 1B, 1C, 2, 3A-3D, 3A1, 4, 4A, 4B and 4C. The brush head may be a vacuum cleaner accessory which is detachably attachable to a vacuum cleaner or an integral part of a vacuum cleaner.

The housing 110 comprises a forward housing portion (“forward portion”) 112, a rearward housing portion (“rear portion”) 114, an intermediate housing portion (“intermediate portion”) 116 which interconnects the forward portion and the rearward portion. A tank receptacle 118 is formed on the intermediate housing portion and occupies substantial portion of the intermediate housing portion. The tank receptacle 118 defines a tank receptacle compartment which is opened on and accessible from the upper side of the rigid housing. The example housing has a generally T-shaped profile, having a wider forward portion and a narrower rear portion which projects rearwards from middle of the forward portion, when viewed from above. The housing comprises an upper housing portion (or top housing portion) and a lower housing portion (or bottom housing portion) which cooperate to define an internal housing compartment of the brush head having an upper side (or a top side) and a lower side (or a bottom side). The example lower housing portion comprises a rigid cover plate which is a bottom cover plate 111 attached to the upper housing portion by fastening means such as screws. The example rigid cover plate is a steel plate which closes the bottom side internal housing compartment and defines the bottom surface of the housing and the brush aperture when mounted on the upper housing portion.

The housing has a longitudinal axis X-X′ defining a longitudinal direction. The longitudinal axis X-X′ extends along the longitudinal direction between a first longitudinal end where the forward portion is located and a second longitudinal end where the rearward portion is located. In the present example, the longitudinal axis X-X′ is a center axis of the housing about which the housing is laterally symmetrical or substantially laterally symmetrical. The longitudinal direction when extending from the rearward portion towards the forward portion defines a forward direction and the longitudinal direction when extending from the forward portion towards the rearward portion defines a rearward direction.

The roller brush 120 is mounted on a roller brush receptacle (“brush receptacle” in short) which is formed on the forward housing portion. The brush receptacle 122 is elongate and extends along a lateral axis which is orthogonal to the longitudinal axis in this example. The brush receptacle comprises a first side wall, a second side wall and a peripheral wall interconnecting the first side wall and the second side wall which cooperate to define a brush receptacle compartment. The first side wall and the second side wall are on opposite lateral sides of the longitudinal axis and are on the same vertical level above a supporting surface when the brush head is working or resting on a planar supporting surface. The brush receptacle peripheral wall is arcuate and curves to extend in the longitudinal direction to follow the shape of the brushing surface of the roller brush on extending along the longitudinal direction.

The roller brush 120 comprises a rigid main body which defines a roller axis or a rotation axis about which the roller brush is to rotate during operations and a brush portion which extends around the rotation axis to surround the main body and to define a brushing surface. The rigid main body is attached to the brush receptacle to define an axle so that the roller brush is to rotate about the rotation axis relative to the brush receptacle during operations. The roller brush is mounted such that a major portion of the roller brush is received inside the brush receptacle compartment while a minor portion protrudes from a brush aperture to encounter or engage a surface to be brushed or cleaned. The example roller brush is substantially cylindrical and defines a substantially cylindrical brushing surface which surrounds the rotation axis and which surrounds the roller brush main body. The example roller brush has a felt brushing surface to facilitate contact or agitated cleaning of a surface to be cleaned.

The brush aperture is an elongate aperture which is formed on the bottom side of the housing and is define between a first long-edge which is a forward edge and a second long-edge which is a rear edge that is parallel to the forward edge. The lateral extent of the brush aperture is defined by a pair of lateral edges which interconnects the first and second long edges at their lateral ends. Each of the example long edges extends transversely to the longitudinal axis to define a transversely extending brush aperture and a plurality of washer dispensing nozzles 142 is distributed along the forward edge. The washer dispensing nozzles 142 are arranged to discharge washer liquid towards a forward-facing surface of the roller brush, for example, at the forward-facing surface of the roller brush near the bottom of the brushing surface which is proximal the contact surface to be cleaner. The washer dispensing nozzles are connected to the first tank 140 which is a washer tank for storing washer liquid and the washer liquid is delivered to the washer dispensing nozzles by a motor-driven water pump which is mounted on a pump compartment of a pump receptacle.

The example roller brush is driven by a drive motor and operation of the drive motor is controlled by a control circuitry, for example, a microprocessor-based or logic-array-based control circuitry. The drive motor is mounted on a motor compartment of a motor receptacle which is in the forward housing portion and immediately behind the brush receptacle. The example motor receptacle is formed on a lateral side of the forward housing portion and projects laterally from the tank receptacle. The example pump receptacle is on another lateral side of the forward housing portion and projects laterally away from the tank receptacle and away from the motor receptacle. The disposing of the motor receptacle and pump receptacle on diametrically opposite lateral sides of the forward portion provides a more balanced weight to press the brushing surface of the roller brush on the surface to be brush cleaned. In the example, the drive motor is mounted on the left side of the forward housing portion, with the drive motor axis parallel to the roller axis, and the pump motor is mounted on the right side of the forward housing portion, with the pump motor axis parallel to the roller axis.

The tank assembly 130 is mounted on the tank receptacle 118. The tank assembly comprises a first tank portion 140 defining a washer liquid tank, a second tank portion 150 defining a waste liquid tank, a waste liquid inlet duct, a liquid separator, an exhaust air duct, and a tank cover. The example tank assembly, as depicted in FIG. 1A, comprises a tank housing comprising a bottom tank surface 132 (or “bottom surface” in short) and a peripheral tank wall 134 surrounding the bottom surface. The bottom tank surface is also the bottom surfaces of the first and second tank portions. The peripheral tank wall extends upwardly along an outer boundary of the bottom surface and defines a portion of the peripheral walls of the first and second tank portions. The example tank assembly is molded, for example, of plastics such as clear plastics. The bottom tank surface is a first surface (or upper surface) of a sheet-like member which forms the bottom portion of the tank housing. The sheet-like member has a lower surface which is to seat in abutment with an upward facing surface of the tank assembly receptacle 118.

The example tank housing is partitioned, vertically, into a first tank compartment defining the washer liquid tank and a second tank compartment defining the waste liquid tank, for example, by a partition wall. The first tank compartment is on a first lateral side of the longitudinal axis and the second tank compartment is adjacent to and abuts the first tank compartment. The example first tank compartment is substantially smaller than the second tank compartment and has an effective volume of 50% or less of the second tank compartment in this example. In the example, the first tank compartment is on right side of the longitudinal axis and the second tank compartment is on left side of the first tank compartment. In some embodiments, the first tank compartment may be on right side of the longitudinal axis and the second tank compartment is on left side of the first tank compartment. In some embodiments, the first tank compartment may surround the second tank compartment or vice versa.

The second tank portion 150 comprises a first riser duct 152 and a second riser duct 154. Each one of the riser ducts 152, 154 comprises a tubular portion which rises from the bottom tank surface 132 and surrounds a through aperture which is formed on the bottom tank surface so that the riser duct defines a fluid passageway to facilitate fluid communication between the second tank portion 150 and the outside across the bottom tank surface when the tank assembly is closed with the tank cover 136 in due place. In this example, the first riser duct 152 is a waste liquid inlet duct which is located forward of the second riser duct 154 so that the waste liquid inlet duct 152 is intermediate the second riser duct 154 and the brush aperture or brush receptacle.

An air-liquid separator (or “liquid separator” in short) 156 is disposed above the first riser duct 152 to form a ceiling of the second tank portion 150 to facilitate separation of air and waste liquid from an air stream coming in from the waste liquid collector which contains both air and collected waste liquid. The liquid separator comprises a baffle plate portion having a baffle surface which is disposed above and proximal the top end or outlet of the first riser duct 152. The baffle plate portion is located at a vertical distance above the outlet of the first riser duct 152 so that an air-waste-liquid stream exiting from the first riser duct 152 will impinge the baffle plate to facilitate air-liquid separation. The baffle plate portion is inclined so that the waste liquid separated from an incoming air-waste-liquid stream will move along the inclined baffle surface and be collected in the waste liquid tank. In this example, the baffle surface 156A is included towards a forward portion of the peripheral tank wall 134 which is intermediate the first riser duct 152 and the roller brush or the brush receptacle. The example liquid separator comprises a non-water permeable separator plate having a perforated region and a non-perforated region. The non-perforated region includes the impinging region where the incoming air-liquid stream is to impinge the separator plate and the surrounding region, especially the region which is forward of the impinging region. The perforated region is away, distal from and/or rearward of the impinging region so that air can freely move between the space which is below and the space which is above the separator plate. The example separator plate is a hard-plastic plate.

The tank assembly 130 comprises a top cover 136. The example top cover is detachably attachable to the tank housing so that washer liquid can be added to the washer tank and collected and stored waste liquid can be removed from the waste liquid tank. The top cover 136 comprises a lid portion and a peripheral lip portion surrounding the lid portion. When the top cover 136 is attached to the tank housing and fastened with the tank housing using the fastening means provides, which is a pair of clasps comprising clasps on opposite diametric sides of the tank housing, the second tank portion 150 will become effectively airtight and air can only effectively enter or exit through the riser ducts 152, 154. When the top cover is in fastening engagement with the tank housing, the peripheral lip portion of the top cover is in air-sealed engagement with the peripheral tank wall 134.

The second tank compartment comprises two sub-portions, namely a first sub-portion 150A containing the first riser duct 152 and a second sub-portion 150B containing the second riser duct 154. The first sub-portion 150A of the second tank compartment defines a first waste liquid tank portion which has a bottom surface 158A which is proximal to bottom cover plate 111 and below the roller axis. The second sub-portion 150B of the second tank compartment defines a second waste liquid tank portion which has a bottom surface 158B which is elevated above the bottom surface 158A of the first sub-portion 150A and is above the roller brush, as depicted in FIG. 3A1.

The first sub-portion 150A and the second sub-portion 150B cooperate to define a waste liquid reservoir having a multi-level surface. In this example, the first level is defined by the first bottom surface 158A and the second level is defined by the second bottom surface 158B. The example waste liquid reservoir has a smaller cross-sectional area at the first sub-portion 150A between the first bottom surface 158A and the second bottom surface 158B, and a substantially larger cross-sectional area above the elevated second bottom surface 158B of the second sub-portion 150B. In example embodiments, the first sub-portion 150A has a cross-sectional area of about 50%-60% of the cross-section area of the second tank compartment immediately above the second bottom surface 158B. In example embodiments, the second bottom surface 158B is at about half the height of the first riser duct 152. In some embodiments, the second bottom surface 158B is slightly higher or slightly lower than half the height of the first riser duct 152. The example second tank compartment has a stepped design and, in some embodiments, the maximum allowable waste liquid level may be set at a level which is slightly higher than the second bottom surface 158B. For example, the maximum allowable waste liquid level may be set at a fraction of the distance between the waste liquid outlet and the second bottom surface 158B, and the fraction may be between 40%-60% as a convenient example.

The internal housing compartment comprises a first side compartment which is on a first lateral side of the washer tank receptacle and a second side compartment which is on a second lateral side of the washer tank receptacle. The first side compartment and the second side compartment are on different lateral sides of the longitudinal axis and both the first side compartment and the second side compartment projects rearwards from the roller brush and from the brush compartment.

The washer liquid tank and the washer nozzles are connected by a washer liquid delivery duct (or “washer duct” in short). A washer pump is mounted inside the first side compartment and is to operate to deliver washer liquid from the washer tank to the washer nozzles through the washer duct. The washer nozzles, the washer liquid delivery duct and the washer pump collectively define a washer applicator. In some embodiments, the brush head has a single washer nozzle, for example, a slot-type nozzle.

A drive motor is mounted inside the second side compartment. The example drive motor is mounted with its driving shaft parallel to the rotation axis of the roller brush and is in driving engagement with the roller brush.

The example upper housing portion and lower housing portion cooperate to define the brush receptacle, the drive motor receptacle and the pump receptacle. The upper housing portion is molded of hard plastics and defines the tank receptacle.

In example embodiments such as the present, the apparatus comprises electronic circuitry which synchronizes operations of the washer pump and the drive motor such that when the drive motor is switched on to rotate the roller brush, the washer pump will begin to operate to deliver washer liquid to the washer nozzles and vice versa. The electronic circuitry may be installed in the internal housing compartment between the side compartments as a convenient example.

A waste liquid collector is disposed on the forward housing for collecting waste liquid at the rear edge of the brushing aperture. The waste liquid collector comprises an elongate inlet which is opposite facing the brushing surface and which extends along the rear edge to form a waste liquid suction inlet (waste liquid inlet). The waste liquid inlet tapers to narrow transversely to connect to a waste liquid collection duct (or “waste liquid duct” in short) for guiding waste liquid to move from the brushing aperture to the waste liquid tank. The waste liquid duct 182 comprises a forward duct portion which extends rearwards from the rear edge of the brushing aperture. The example waste liquid collector comprises a scraper. The example scraper comprises a flexible scraper having a forward flexible lip portion which projects from the rear edge of the brush aperture and extends into the brush receptacle to interfere with the brushing surface. The example lip portion is made of rubber, for example, natural rubber or synthetic rubber such as silicone rubber or other flexible, non-washer liquid permeable materials without loss of generality. The scraper is connected to the waste liquid suction inlet and the waste liquid collected at the waste liquid suction inlet is delivered to the waste liquid tank by moving through the waste liquid duct and the first riser duct 152.

During operations, the roller brush rotates and the portion of the brushing portion which carries liquid is rotated into physical interference with the scraper. As a result of the physical interference between the scraper and the brushing surface, liquid carried on the brushing surface is transferred from the scraper to the waste liquid suction inlet and the suction power appearing at the waste liquid suction inlet will transport the collected waste liquid into the first riser duct and into the waste liquid tank 150.

The forward duct portion of the waste liquid duct is inside the intermediate housing portion and extends rearwards from the brushing aperture and underneath the tank receptacle. The waste liquid duct joins the first riser duct 152 at its bottom end. The riser duct portion extends to a level which is above the maximum allowable liquid level of waste liquid inside the waste liquid tank. The maximum allowable liquid level divides the waste liquid tank into two portions vertically, namely, a waste liquid reservoir at or below the maximum allowable waste liquid level and an air space above the maximum waste liquid level. In the present example, the top end of the riser duct portion is well above the maximum waste liquid level and is close to the tank cover.

The suction connector 190 is for facilitating physical interconnecting of the brush head and a main unit. The main unit comprises a vacuum suction generator and a connector for making physical interconnecting with the suction connector 190 of the brush head 100. The example suction connector 190 is at the rear end of the brush head. The suction connector comprises a tubular portion having a first end and a second end. The first end is an outlet end which is for connection to a suction source such as the vacuum suction generator of a vacuum cleaner and the second end is an inlet end which is connected to an exhaust dust arrangement. The exhaust duct arrangement comprises an exhaust duct portion which interconnects the second riser duct and the suction connector. The example exhaust duct portion is installed underneath the second sub-portion 150B of the waste liquid tank 150 and extends rearwardly to join the suction connector 190. A physical and electrical connector for making physical and electrical connection with a corresponding physical and electrical connector is provided on the suction connector 190 proximal the inlet end.

The suction connector 190 is articulated to the rear portion of the rigid housing and extends upwardly and away from the rear portion. The suction connector is articulated to the rear portion of the rigid housing and is pivotally movable relative to the rigid housing between a first angle and a second angle which defines an angular movement range of the suction connector. The example angular movement range is slightly smaller than 90 degrees, for example, between a near level first angle of slightly larger than zero degree and a near vertical angle of slightly smaller than 90 degrees from the vertical. To facilitate angular relative movement between the suction connector and the rigid housing, the exhaust duct portion comprises a flexible duct portion, for example, a bellows-type duct portion to connect the second riser duct and the suction connector. The suction connector 190 comprises an electrical power connector which is to electrically engage with a corresponding electrical power connector on a main unit when the brush head and the main unit is physically connected and duly engaged when the suction connector is duly connected with a corresponding connector on the main unit.

A pair of wheels is mounted on the rearmost end of the rear housing so that a user can move the brush ahead along a contact surface.

To use the brush head, a user will remove the tank cover and fill the washer tank 140 with a washer liquid and/or remove waste liquid. After the washer tank 140 has been filled with a washer liquid and the waste liquid in the waste liquid tank emptied, the user is to cover the tank assembly to make it air-tight, as depicted in FIGS. 5A and 5B. The brush head is then attached to a vacuum power source (not shown) by connecting the suction connector to the vacuum power source. To operate, a user will operate a switch to turn on the drive motor to rotate the roller brush. When the drive motor is in driving operation, the user may selectively activate the washer applicator to apply washer liquid to the roller brush and the washer liquid will be discharged through the plurality of washer dispensing nozzles and ejected towards the roller brush, as depicted in FIGS. 5C and 5D. The example control circuitry synchronizes operation of the drive motor and the vacuum power source such that the vacuum power source operates to supply vacuuming suction to the brush head when or whenever the drive motor is in driving operation. In this example, the roller brush is to rotate anticlockwise. When the roller brush rotates, the brushing portion which was in contact with the surface to be agitated and brush cleaned will be rotated to an interference position at which the scraper is in scraping encounter with the brushing surface. When the roller brush is in rotational scraping encounter with the scraper, the liquid which is carried on the brushing surface will be scraped off and transferred to the scrapper. Operation of the suction power source will generate a vacuuming suction which will cause the liquid collected by the waste liquid inlet to move through the waste liquid duct and then into the waste liquid tank. When an incoming air-liquid stream which comes into the waste liquid tank via the first riser duct encounters the liquid separator, the incoming air-liquid stream will be separated into liquid and air and the separated liquid and air will travel along different courses. The liquid which is separated from the incoming mixture stream will move along the inclined separator plate, travel downwards and move into the waste liquid reservoir due to gravity. The air which is separated from the incoming mixture stream will move into the space above the separator plate, then enter the exhaust inlet of the second riser duct, move downwards along the second riser duct which is an exhaust air duct, and finally enter the exhaust duct arrangement and to exit from the brush head at the air suction inlet end of the suction connector, as depicted in FIGS. 5E and 5F.

In an example embodiment, the brush head is physically and electrically connected to a main unit to form a stick-type vacuum cleaner, as depicted in FIGS. 6A to 6D. The example stick-type vacuum cleaner comprises an elongate main body having a lower end on which a physical and electrical connector for making physical and electrical connection with the brush head is formed. The elongate rigid main body of the main unit has an upper portion on which a handle portion is defined. The physical and electrical connector may comprise a control connector such that control signals can be wire transmitted to operate the drive motor and the water pump, so that the control circuit of the brush head is not necessary or by-passed. In some embodiments, the control circuitry of the brush head may have a wireless frontend to receive wireless control signals to facilitate operation of the drive motor, the washer, and possible other devices without loss of generality.

In example embodiments such as the present, the elongate main body of the main unit comprises a hand-held vacuum cleaner receptacle and a hand-held vacuum cleaner is detachably mounted in the vacuum cleaner receptacle to provide the required vacuuming suction power.

A cleaning head of the present disclosure comprises a suction portion, a waste removal portion and a storage portion.

The suction portion comprises a suction compartment, a suction interface which is configured for making fluid connection to a suction power source, and a suction network interconnecting the suction compartment and the suction interface.

The suction compartment comprises a compartment housing, an entry aperture through which waste enters the suction compartment, and an exit aperture through which waste leaves the suction compartment.

The suction network comprises a first fluid communication arrangement which interconnects the exit aperture of the suction compartment and the second container and a second fluid communication arrangement which interconnects the second container and the suction interface.

The waste removal portion comprises a roller cleaner having a roller axis and mounted inside the suction compartment, a cleaning-liquid applicator for applying cleaning liquid to the roller cleaner, a waste removal arrangement, a drive mechanism configured to drive the roller cleaner into rotation about the roller axis and relative to the waste removal arrangement, and an electrical interface configured for making electrical connection to an electrical power source to obtain electrical power to operate electrical parts, such as the drive mechanism and the cleaning-liquid applicator, of the cleaning head.

The storage portion comprises a first container which is configured as a cleaning liquid container for storing a cleaning liquid and a second container which is configured as a waste container for storing waste collected by the suction portion. The waste container is configured to store solid waste and liquid waste and waste herein comprises waste and liquid waste unless otherwise specified. The waste container comprises a separator for separating waste from the air stream which carries the waste. The waste container comprises an air filter which is configured to block solid waste from leaving the waste container after being separated from the waste liquid.

The cleaning liquid applicator is configured to draw cleaning liquid from the first container and to apply the cleaning liquid to the roller cleaner. The roller cleaner comprises a water absorbent outer layer which is configured to agitate a surface to be cleaned to perform contact cleaning. The outer layer of the roller cleaner may be configured to have a generally cylindrical shape, with the roller axis being coaxial with the cylindrical axis. The water absorbent outer layer may be a felt layer, a fabric layer or a layer of suitable liquid absorbing material, and may be configured as a roller brush or a porous roller. The cleaning liquid may be water, an antiseptic aqueous solution, or any cleaning liquid suitable for floor or surface cleaning and/or sanitization.

To enhance effective cleaning contact between the roller and the surface and to facilitate cleaning by wiping or agitation, the entry aperture is formed as an elongate aperture at the bottom of the suction compartment. The elongate aperture has a length which is sufficient to permit the entire length of the roller to protrude below the entry aperture. The length of the roller and the length of the elongate aperture are both measured in the direction of the roller axis. The elongate aperture may have a width which is slightly larger than the width of the portion of the roller at the entry aperture to permit suction of solid waste in the vicinity of the roller contact surface. The roller contact surface being the portion of the roller which is in physical contact with the surface to be cleaned. The outer layer of the roller cleaner may be resilient to enhance contact cleaning effectiveness.

During cleaning operations, the roller is configured to be driven by the drive mechanism so that each circumferential portion of the roller is to repeatedly reciprocate between an upstream position which is before the entry aperture and a downstream position which is after the entry aperture.

The cleaning liquid applicator is configured to apply cleaning liquid to the roller cleaner (or “roller” in short). The circumferential portion of the roller becomes an upstream portion when it reaches a position juxtaposing the cleaning liquid applicator or after it has been applied with the cleaning liquid and before reaching the entry aperture. The upstream portion of the roller is then driven towards the entry aperture. When the upstream portion of the roller reaches the entry aperture, that portion of the roller will expose through the entry aperture and will enter into cleaning contact with the surface to be cleaned. Driven rotation of the roller relative to the surface while the roller is in contact therewith will result in cleaning agitation of the surface by the roller. The circumferential portion of the roller becomes a downstream portion once it passes the entry aperture.

The waste removal arrangement is configured to remove waste from the downstream portion of the roller by physical contact therewith before the roller reaches the upstream position, that is, the position juxtaposing the cleaning liquid applicator, again. The waste collection arrangement may comprise a waste remover which is configured to physically interact with the downstream portion to help remove solid and liquid waste from the cleaning head. An example waste remover may comprise a waste scraper which is configured to be in contact with a downstream portion of the roller.

The waste removal arrangement is in fluid communication with the suction network such that waste removed by the waste removal arrangement will be collected by suction and enters into the suction network. The suction network comprises a waste collection port which is a suction port formed at an upstream end of the suction network and which is in abutment with the exit aperture of the suction compartment. The waste collection port is configured such that suction power applied at the suction interface will appear as suction power at the waste collection port and the suction compartment. The waste collection port is formed on a periphery of the suction compartment and defines a waste inlet through which solid waste and liquid waste are to leave the suction compartment.

An example cleaning head comprises a main housing having a main axis which defines a rolling direction along the main axis to perform roller cleaning operations. The main housing comprises a first portion defining a first end of the cleaning head, a second portion defining a second end of the cleaning head, and an intermediate portion which is intermediate the first portion and the second portion. The cleaning head is configured to be driven to move in a first rolling direction such that the first portion is a forward portion having a forward end and the third portion is a rearward portion having a rearward end. In some embodiments, the cleaning head is also configured to move in a second rolling direction opposite to the first rolling direction such that the second portion is a forward portion having a forward end and the first portion is a rearward portion having a rearward end.

The suction compartment is elongate and extends along a direction which is parallel to the roller axis. The suction compartment comprises an upper housing portion which is closed at least during operations and a bottom housing portion on which an entry aperture having an aperture axis is defined. The cleaning roller is mounted inside the suction compartment with the roller axis parallel to the aperture axis and with a circumferential portion exposed at and protruding from the entry aperture so that when the cleaning head is placed on a surface to be cleaned, the roller axis is parallel to the surface and the exposed circumferential portion of the cleaning head is in frictional and compressive contact with the surface to be cleaned.

The machine compartment is configured to receive electrical and mechanical components such as the drive mechanism, parts for driving the cleaning liquid applicator and electronic circuitry. In example embodiments, the machine compartment abuts the suction compartment and shares a partitioning wall with the suction compartment.

In example embodiments, the first portion, the intermediate portion and the second portion are disposed sequentially along the rolling direction.

In example embodiments, the first portion defines a suction compartment, the second portion defines a storage receptacle, and the intermediate portion defines a machine compartment.

In example embodiments, the storage receptacle is configured to receive the first container and the second container.

In example embodiments, the suction interface is connected to the main housing, and more particularly, connected to the third portion of the main housing.

An example cleaning head comprises a suction portion, a waste removal portion, a storage portion, and a main housing, as described herein and as shown in FIGS. 7A to 16. The example cleaning head 200 comprises features which are substantially identical to that of the brush head 100 and the description thereon is incorporated by reference and applied mutatis for the benefit of succinctness, with like numerals representing like features but increased by 100.

The example storage portion comprises a tank assembly. The tank assembly 230 comprises a first tank 240 as an example of a first container defining a first reservoir and a second tank 250 as an example of a second container defining a second reservoir. The cleaning head comprises a first liquid delivery path which is configured to deliver washer liquid from the first reservoir to the roller brush and a second liquid delivery path which is a waste collection path configured for transporting waste liquid from the roller brush to the second tank. The example cleaning head comprises a suction connector 290 which is an example suction interface. The suction connector 290 comprises a tubular portion having a first end which is a free end defining a suction inlet and a second end which is mounted on the main housing and in fluid-tight communication with the second tank 250. In example embodiments such as the ones depicted herein, the suction interface is hinge-connected to the main housing. The hinge may for example be a pivotal hinge or a universal hinge so that the suction interface can change its inclination with respect to the main housing. The cleaning head is configured to operate in a first rolling direction such that the suction compartment is forward of the suction interface.

In this example configuration, the main housing 210 comprises a first portion which is a forward housing portion (“forward portion”) 212 defining a suction compartment, a second portion which is a rearward housing portion (“rear portion”) 214 defining a storage receptacle, and an intermediate housing portion (“intermediate portion”) 216 which interconnects the forward portion and the rearward portion and defining a machine compartment 260, as depicted in FIGS. 9A and 10A. The main housing 210 comprises an upper housing portion (or top housing portion) and a lower housing portion (or bottom housing portion) which cooperate to define an internal housing compartment of the brush head having an upper side (or a top side) and a lower side (or a bottom side).

The portion of the main housing which defines the suction compartment comprises a fixed portion and a movable portion 212A which is movable relative to the fixed portion. The fixed portion is integrally formed with the intermediate portion and cooperates with the movable portion to define a re-closable suction compartment to facilitate removal of the roller cleaner for replacement or for cleaning. The suction compartment comprises an elongate entry aperture which extends along an aperture axis which is parallel to the roller axis. The elongate aperture is a suction aperture which provides a suction interface between the cleaning head and the surface to be cleaned. The fixed portion comprises a pair of holding arms which is configured for retaining the roller cleaner in its operational position. The pair of holding arms comprises a first holding arm which is configured for holding a first axial end of the roller and a second holding arm for holding a second axial end of the roller. The pair of holding arms is configured so that when the roller is held in the operational position, the roller axis and the aperture axis are parallel and the roller is rotatable relative to the suction compartment. Each of the holding arms projects away from the intermediate portion of the main housing so that the roller is cantilevered above the elongate entry aperture of the suction compartment.

The suction network comprises a riser duct portion and a suction channel which interconnects the waste collection port and the riser duct portion. The suction channel is underneath the intermediate compartment and is defined between a bottom wall portion of the machine compartment and a bottom cover 211 of the cleaning head. The riser duct extends through the machine compartment and has an inlet end which is integrally formed on the bottom wall of the machine compartment. The suction channel comprises a first end which defines the waste collection port 284 and a second end which abuts the inlet end of the riser duct portion. The waste collection port defines an elongate inlet aperture juxtaposing the roller. The elongate inlet aperture is a narrow slit having a length comparable to the length of the roller and a width which is very small, for example, a width equal to a small fraction of the diameter of the roller, say less than 5-10%. The suction channel tapers to narrow as it extends from the waste collection port towards the riser duct portion. The suction channel defines a suction plane which is parallel to a plane defined by the main axis Y-Y′ and the roller axis Z-Z′. The suction plane has a fan-shaped configuration so that suction power coming from the riser duct portion is distributed along the length of the waste collection port. The waste collection port has a small width so that a working suction can be maintained at the waste collection port. To maintain a good working suction, the slit of the waste collection portion should have an area which is smaller than the passage area of the riser duct portion. The suction channel is intermediate the machine compartment and the surface to be cleaned during vacuum cleaning operations.

The bottom cover of the main housing which cooperate with the bottom wall portion of the machine compartment has a first end which is fitted with a scraper blade 211A. The scraper blade is configured to be in compressive contact with the roller along its length to facilitate removal of waste from the roller when the roller is driven to rotate against the blade. The scraper blade is configured as a “squeegee” to squeeze the roller whereby waste is detached from the roller. A plurality of ribs is disposed on an inner surface of the bottom cover which defines the suction channel. The ribs are arranged to guide waste coming in from the waste collection port to move towards the riser duct 252. The ribs are arranged to extend radially from the inlet end of the riser duct portion, as shown in FIG. 8B.

Referring to FIGS. 8A and 8B, the roller brush 220 as an example roller cleaner is mounted inside the suction compartment. An elongate portion of the roller brush 220 is exposed through the elongate opening defined between the scraper and a forward end of the main housing. The exposed portion of the roller cleaner is a circumferential portion of the roller cleaner which protrudes to extend beyond the elongate suction aperture defined by the bottom cover in cooperation with the forward portion of the main housing. The bottom portion of the machine compartment defines a recess having a forward end where the waste collection port is located and a rearward end where the riser duct portion is located. The recess is defined by a bottom portion of the machine compartment and a peripheral wall which defines the rearward end of the recess. The recess has a depth which progressively increases on extending towards the rearward end so that the depth of the recess at the rearward end is at a maximum and the depth at the forward end is at a minimum. The bottom cover 211 is attached to the peripheral wall by, for example, friction fit or other fastening means such as screws. The bottom cover 211 has a generally triangular profile complementary to the shape of the recess on the lower housing portion. One side 211A of the bottom plate has substantially the same length as the width of the opening and is to be arranged facing the roller brush to receive used liquid therefrom. The peripheral wall extends downwardly from the rearward boundary of the recess. The ribs strengthen the bottom cover 211 and facilitate the used liquid to flow evenly towards an angle portion. When the bottom cover is mounted on the lower housing portion, the angle portion is directly below the duct inlet. After the used liquid enters the bottom cover from the side 211A, it is guided towards the angle portion opposite the side 211A, and leaves the bottom cover through the duct inlet.

Referring to FIGS. 9A to 11B, the tank assembly 230 is configured to be mountable on the intermediate portion 216 of the housing 210. The first tank 240 has a water outlet 244A, which is continuous to a water inlet 244B of the first liquid delivery path inside the housing 210. An air pore 246 may be provided on the cover of the first tank for air to enter the tank. The second tank 250 comprises a connection portion for connection to the intermediate portion 216 and a container portion for retaining the used liquid. The container portion has a greater depth than the connection portion. A water inlet and an air outlet are provided on the connection portion on the side facing the intermediate portion 216. When the second tank 250 is mounted on the housing 210, the water inlet is continuous to the duct inlet on the lower housing portion, and the air outlet is continuous to the suction connector 290. An air-liquid separator 256 is disposed on the air outlet on the connection portion to facilitate separation of air and waste liquid from an air stream coming in from the second tank which contains both air and collected waste liquid.

Referring to FIGS. 12 to 13, a tube is provided inside the second tank 250. The tube extends from the water inlet of the connection portion to the container portion. It facilitates fluid communication between the duct inlet on the lower housing portion and the container portion of the second tank. The tube rises vertically from the water inlet and then extends transversely away from the connection portion.

FIGS. 14 and 15 show components inside the rigid housing 210. A control board 262 is provided inside the rigid housing 210 to control the operation of the brush head. The control board 262 is to operate a water pump 264 and a motor 266. The water pump 264 is arranged to drive liquid from the first tank 240 to the roller brush via the liquid distribution plate 268 and the associated tubing. The motor 266 is arranged to drive the roller brush into brushing rotation.

FIG. 16 shows the control circuitry of the brush head. The control circuitry comprises the control board 262, which comprises a processing unit, such as a microprocessor. The microprocessor receives input power from a power source of, for example, DC 15-35V. The microprocessor receives and processes input signal from various sensors S1-S6; and output signal to drive the water pump 264, the motor 266 and various LED indicators L1-L5. Referring to FIGS. 9A-10B, various sensors are provided on the rigid housing 210. A liquid detection sensor S1 and a dirty water tank position sensor S2 are arranged on the side in close proximity to the second tank 250. A liquid detection sensor S3 and a clean water tank position sensor S4 are arranged on the side in close proximity to the first tank 240.

The liquid detection sensor S1 is located at a position close to the maximum allowable water level of the container portion of the second tank 250. It sends a signal to the microprocessor when the liquid in the second tank 250 reaches the maximum allowable water level. Upon receiving the signal, the microprocessor outputs signal to stop operation of the motor 266 and instructs LED L1 to light up. The dirty water tank position sensor S2 is located at a position near the bottom of the second tank 250. It detects the presence of the second tank 250, and send the corresponding signal to the microprocessor, which prevents the motor from operation and lights up LED L2 if the second tank is not in place. The liquid detection sensor S3 is located at a position close to the minimum allowable water level of the first tank 240. It sends a signal to the microprocessor when the liquid in the first tank 240 reaches the minimum allowable water level. Upon receiving the signal, the microprocessor outputs signal to stop operation of the water pump 264 and instructs LED L3 to light up. The clean water tank position sensor S4 is located at a position near the bottom of the first tank 240. It detects the presence of the first tank 240, and send the corresponding signal to the microprocessor, which prevents the water pump from operation and lights up LED L4 if the first tank is not in place.

In some embodiments, the brush head is provided with at least one safety sensor, which sends a signal to the microprocessor to stop the operation of the system, including the motor and the water pump, when the brush head is not ready for use. For example, a safety sensor S5 is provided to detect if the user lifts the brush head off the floor. A safety sensor S6 is provided to detect if the brush head is in a slanting position, for example, is slanted for over 30 degrees.

In some embodiments, the liquid detection sensor S1 and/or liquid detection sensor S3 may be a single-point photoelectric level sensor. The dirty water tank position sensor S2 and the clean water tank position sensor S4 may be a micro-switch. The safety sensor S6 may be a tip over sensor.

In some embodiments, the LEDs are surface mounted diode (SMD) type LEDs. The LEDs light up in the following event:—

LED Event L1 The second tank is full L2 The second tank is missing L3 The first tank is out of water L4 The first tank is missing L5 Safety events, for examples, the brush head is lifted off the floor or slanted for over 30 degrees

While examples and embodiments have been described herein, persons skilled in the art would understand and appreciate that the examples and embodiments are to assist understanding and are not intended to be limiting or restrictive. Ordinal numbers such as ‘first’, ‘second’, ‘third’, etc., are used herein only as labels and do not carry or intend to carry a meaning of order or level of significance. The term cleaning liquid is also referred to as a washer liquid herein. The expression orthogonal herein includes substantially or generally orthogonal.

Table of numerals Brush head or Cleaning head 100 Rigid housing or Main housing 110, 210 Bottom cover plate 111 Forward housing portion (forward portion) 112, 212 Rearward housing portion (rear portion) 114, 214 Intermediate housing portion (intermediate portion) 116, 216 Tank receptacle 118 Roller brush 120, 220 Brush receptacle 122 Tank assembly 130, 230 Bottom tank surface 132 Peripheral tank wall 134 Tank cover 136 First tank 140,240 Washer dispensing nozzles 142 Second tank portion 150, 250 First sub-portion 150a Second sub-portion 150b First riser duct, Waste liquid inlet duct 152, 252 Second riser duct 154 Air-liquid separator (liquid separator) 156, 256 Baffle surface 156a First bottom surface 158a Second bottom surface 158b Waste liquid duct 182 Waste collection port 284 Suction connector, 290 190 Movable portion 212A Bottom cover 211 Scraper blade 211A Water outlet 244A Water inlet 244B Air pore 246 Machine compartment 260 Control board 262 Water pump 264 Motor 266 Liquid distribution plate 268 

1) A cleaning head comprising: a suction interface comprising a tubular portion configured for connection to a suction power source and an electrical interface; a suction network connected to the suction interface, the suction network comprising a waste collection port forming an upstream end of the suction network and a waste container interconnecting the suction interface and the waste collection port; a suction compartment in fluid communication with the waste collection port, the suction compartment comprising an elongate entry aperture having an aperture axis; a roller cleaner mounted inside the suction compartment, the roller cleaner having a roller axis parallel to the aperture axis and an elongate outer surface portion protruding through the elongate entry aperture; a machine compartment inside which a drive mechanism and electronic circuitry are mounted, the drive mechanism being configured to drive the roller cleaner to rotate about the roller axis to perform cleaning; a storage portion comprising a cleaning liquid container and the waste container mounted on a storage receptacle; a cleaning liquid applicator configured to draw cleaning liquid from the cleaning liquid container and to apply the cleaning liquid to the roller cleaner; and a waste remover configured to physically interact with the roller cleaner to remove waste therefrom; wherein the waste collection port is configured to collect waste removed from the roller cleaner by suction and the suction network is configured to move the collected waste to the waste container. 2) The cleaning head of claim 1, wherein the electrical interface is configured for connection to an electrical power source to obtain electrical power and control signals to operate electrical parts of the cleaning head, wherein the tubular portion of the suction interface comprises a free end for attaching to a vacuum power source, and wherein the electrical interface terminates at or near the free end. 3) The cleaning head of claim 1, wherein the electrical interface comprises conductors extending along the tubular portion of the suction interface, the conductors comprising signal conductors which are configured to transmit control signals to the electronic circuitry of the drive mechanism. 4) The cleaning head according to claim 1, wherein the cleaning head has a main axis defining a rolling direction which is orthogonal to the roller axis, and wherein the suction compartment is on a first end of the main axis and the suction interface is on a second end of the main axis. 5) The cleaning head according to claim 4, wherein the cleaning liquid container and the waste container are disposed on two lateral sides of the main axis such that the main axis is intermediate the cleaning liquid container and the waste container. 6) The cleaning head according to claim 4, wherein the tubular portion of the suction interface has a tubular axis and the main axis is a center axis which intersects the tubular axis. 7) The cleaning head according to claim 1, wherein the cleaning head comprises a main housing which defines the suction compartment, the machine compartment and the storage receptacle; wherein the storage receptacle is intermediate the machine compartment and the suction interface; and wherein the cleaning liquid container and the waste container are detachably mounted on the storage receptacle. 8) The cleaning head according to claim 7, wherein the suction compartment comprises a first arm and a second arm which project away from the machine compartment and extend in a direction orthogonal to the roller axis and which cooperate to hold the roller cleaner in its operation position such that the roller axis is parallel to the aperture axis. 9) The cleaning head according to claim 8, wherein the main housing comprises a movable portion which is movable between an open state and a close state, wherein the movable portion in the closed state cooperates with the first arm and the second arm to define the entry aperture, and wherein the movable portion in the open state permits removal of the roller cleaner from the suction compartment. 10) The cleaning head according to claim 9, wherein the movable portion is movable about a pivotal axis between the open state and the closed state, the pivotal axis being parallel to the roller axis. 11) The cleaning head according to claim 8, wherein the suction compartment and the machine compartment share a partitioning wall, the partitioning wall extending in a direction parallel to the roller axis and between the first arm and the second arm. 12) The cleaning head according to claim 1, wherein the suction network comprises a riser duct portion and a suction channel interconnecting the riser duct portion and the waste collection port, and wherein the riser duct portion extends through the machine compartment and the suction channel is underneath the machine compartment. 13) The cleaning head according to claim 12, wherein the suction channel flares to widen on extending towards the suction compartment to define the waste collection port, and wherein the waste collection port has a width comparable to the length of the roller cleaner, the length being measured along the roller axis. 14) The cleaning head according to claim 13, wherein the waste collection port is slit having a slit axis which is parallel to the roller axis. 15) The cleaning head according to claim 13, wherein the waste container interconnects the suction interface and the riser duct portion, and wherein the riser duct portion has a duct axis which is orthogonal to the roller axis and which defines the direction of extension of the riser duct portion through the machine compartment. 16) The cleaning head according to claim 12, wherein the suction channel has an internal clearance which increases on extending from the waste collection port to the riser duct portion, the internal clearance being measured in a direction parallel to the direction of extension of the riser duct portion. 17) The cleaning head according to claim 12, wherein the suction channel and the waste collection are defined by a bottom portion of the machine compartment in cooperation with a bottom cover of the cleaning head. 18) The cleaning head according to claim 1, wherein the cleaning liquid applicator is configured to apply cleaning liquid to an upstream portion of the cleaning roller and the waste remover is configured to remove waste from a downstream portion of the cleaning roller. 19) A vacuum cleaner comprising a cleaning head, wherein the cleaning head comprises:— a suction interface comprising a tubular portion configured for connection to a suction power source and an electrical interface; a suction network connected to the suction interface, the suction network comprising a waste collection port forming an upstream end of the suction network and a waste container interconnecting the suction interface and the waste collection port; a suction compartment in fluid communication with the waste collection port, the suction compartment comprising an elongate entry aperture having an aperture axis; a roller cleaner mounted inside the suction compartment, the roller cleaner having a roller axis parallel to the aperture axis and an elongate outer surface portion protruding through the elongate entry aperture; a machine compartment inside which a drive mechanism and electronic circuitry are mounted, the drive mechanism being configured to drive the roller cleaner to rotate about the roller axis to perform cleaning; a storage portion comprising a cleaning liquid container and the waste container mounted on a storage receptacle; a cleaning liquid applicator configured to draw cleaning liquid from the cleaning liquid container and to apply the cleaning liquid to the roller cleaner; and a waste remover configured to physically interact with the roller cleaner to remove waste therefrom; wherein the waste collection port is configured to collect waste removed from the roller cleaner by suction and the suction network is configured to move the collected waste to the waste container. 20) A vacuum cleaner according to claim 19, wherein the vacuum cleaner comprises an elongate body defining a handle portion on a first longitudinal end and a tubular portion at a second longitudinal end distal from the first longitudinal end, wherein a suction power source is received inside the elongate body, and wherein the tubular portion is in fluid connection with the suction interface and is pivotally movable relative to the cleaning head. 